Tool holder for lathes



(No Model.) Q 2 Sheets-She t 1. W. BARRAOLOUGH & A. RHODES.

' TOOL HOLDER PQR LATHES.

No. 495,576. Patented Apr. 18, 1893.

G g .5 Ana (No Model.)

2 Sheets-Sheet 2. W. BARRAOLOUGH &-A. RHODES.

TOOL HOLDER FOR LATHES.

' Patented Apr. 18, 1893.

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UNITED STATES PATENT OFFICE.

WILLIAM BARRAOLOUGH ANDA-LBERT RHODES, OF STANNINGLEY, ENGLAND.

TOOL-HOLDER FOR LATHES.

SPECIFICATION forming part of Letters Patent No. 495,576, dated April 18, 1893. Application filed January 23, 1892. Serial No. 419,092. (No model.) Patented in England May 16, 1890, No. 7,612.

To all whom it may concern.-

Be it known that we, WILLIAM BARBA- CLOUGH and ALBERT RHoDEs, subjects of the Queen of Great Britain, and residents of Stanningley, in the county of York, England, have invented certainv new and useful Improvements in Tool-Holdersfor Lathes, (for which we have obtained a patent in Great Britain, numbered 7,612, and dated May 16, 1890,) of which the following is a full, clear, and exact specification.

This invention relates to tool holders which are used in conjunction with turning and boring lathes, and has for its object to enable the tools which are fixed therein to be quickly and easily adjusted to any required elevation or angle and with minute precision. We at- ,tain these objects by means of the mechanism which is shown in the accompanying drawings, in which: h

Figure 1, is a front elevation of our improved tool holder. Fig. 2, is aside elevation of the same. Fig. 3, is a plan of our improved tool holder. Fig. 4, is a section through A, A, Fig. 1, omitting the tool. Fig. 5, is a section through B, B, Fig. 1, omittingthe tool. Figs. 6 to 15 inclusive are back and front views in perspective, illustrative of various parts of our improved tool holder.

Similar reference characters are employed throughout these illustrations to indicate corresponding parts.

. It will be understood, by those persons who are familiar with engineers tool holders for turning lathes, that the apparatus is usually, if not always, fixed upon an upright center stud or spindle attached to a bed or plate.

In carrying out our invention we furnish our improved tool holder with two duplicate jaw-pieces dovetailed into the stock of the tool holder detachable therefrom at pleasure and capable of being raised or lowered by means of screwed spindles placed conveniently between each jaw-piece and the said stock.

The stock or body, marked N, of our improved tool holder, has a bolt hole, marked M, for the reception of the usual center stud; also two adjustable jaw-pieces, marked 0 I), D, dovetailed into the stock N, and fitted with spindles marked f, for the purpose of raising or lowering each or either of the j awpieccs. Theseadj ustable jaw-pieces are shown detached from the body or stock N, in .Figs. 10, 12, 13 and 15, and the said stock, divested of the jaw-pieces, is shown in Figs. 8 and 9, back and front views.

The slides O, 0, Figs. 8 and 9 receive the dovetailed back part 0 of each jaw-piece. A recess, marked f is formed in the stock N, behind each jaw-piece andincloses a bridgepiece marked F, Figs. 4, 5 and 13, which bridge-piece is operated upon from behind by a screw-threaded bolt marked E, Figs. 2, 3, 4, 5, 7, and 13,inserted through the body of the stock in screw-threaded holes as at E Fig. 8.

In the back of each jaw-piece asemi-circular groove is formed, marked f and made with a screw-thread to correspond with that upon the spindle f The spindlef having annular collars and provisions suitable for revolving it with a spanner or other tool, is designed for association with each of the jawpieces, for the purpose of projecting it to and fro Within the slide O.

A tightening screw, marked L, is fitted into each or either of the jaws D, either the upper or lower one, or both, for the purpose of fixing a tool therein, as shown by J, Fig. 1.

The several parts of this apparatus are put together as follows'lhe metal bridges F, are laid within the cavities f and the screwthreaded spindles f are laid in the semi-circular seats G, G, each movable jaw-piece is then introduced within one end of its dovetailed or astragal slide until the screw-threaded part f 4 engages with the screw-thread upon the said spindle when the latter is revolved until each jaw-piece is drawn into its required position. By revolving the spindles f when the apparatus is complete, the j aw-pieces are raised or lowered and, by leaving the spindles stationary, the jaw-pieces are retained at any elevation required. The screw-threaded bolts, E, press upon the back of the bridges F and cause the latter to push the jaw-pieces forward against their dove-tailed Slides 0 and thereby assist the screw-spindles f in retaining the j aw-pieccs rigidly at any required elevation. When two of these jaw-pieces are thus inserted, adjacently, within the dovetailed slides O, C,and the cutting tool J, is fixed therein, as shown in Fig. 1, the said tool can be adjusted at any angle, or at any elevation required, by means of the mechanism above described for raising and lowering each or eitherof the said jaw-pieces and the tool can be fixed therein, rigidlyin position by means of the set-screws L.

WVe prefer to make certain surfaces of the jaws D, D, slightly convex, as indicated at K, Figs. 1, 6, 10 and 15, which we find favorable for the angling of the tool J, as shown in Fig. 1. We also, as occasion requires, strengthen the jaws D, D, by uniting them together with a tie-piece marked (1 Fig. 15. The bridgepiece F, Figs. 4, 11 and 13, does not impinge upon the screwed spindle f but bears only upon the hinder parts of the jaw-piece, as shown in Figs. 4 and 13. Although we consider, from our experience in using these adjustable jaw-pieces, that the forms of them which we have shown in the drawings herein, are the most generally convenient for the purposes named, yet the essential objects of our invention (namely adjustable jaw-pieces working upon or within slides) may be attained if the slide C,is.made in the jaw-piece and the beveled flanges formed upon the stock N, (similar to the part marked n Figs. 8 and 9) instead of the exact forms shown herein.

Having now particularly described and ascertained the nature of our said invention and in what manner the same is to be performed,

bolt E, and stock N, substantially as and for the purpose set forth.

3. In a tool holder, the stock and the spindlef in combination with the bridge F and adjustable jaw-piece, substantially as and for the purpose set forth.

4. In a tool holder, the adjustable j aw-piece having a dovetail guide-lug, a set-screw L therein, a convex jaw, and a screw-threaded, semi-circular groove, in combination with the stock and an adjusting screw-spindle interposed between the groove and stock and engaging the screw-threaded groove, substantially as and for the purpose described.

5. In a tool holder, the combination of a stock, adjustable jaw-pieces, provided with set screws L, L, and curved pieces K, K; said jaw-pieces being dovetailed in the stock, and provided with threaded parts f; the bridgepieces F, placed in recesses formed in the stock and bearing on the jaw -pieces, the threaded spindles f placed between the bridges and jaw-pieces, and the set screws E, E, inserted in the stock and acting against the rear of the bridge-pieces, substantially as and for the purpose set forth.

6. In a tool holder, the combination of a stock, adjustable jaw-pieces dovetailed in said stock and provided with tool-retaining devices, and having screw-threaded back portions, screw-spindles interposed between the stock and the said screw-threaded back portions and pressure devices to hold the jawpieces in their adjusted positions, substantially as set forth.

WILLIAM BARRAOLOUGH. ALBERT RHODES.

WVitnesses:

CHARLES HENRY HALEY, Traveler, Providence Foundry, Szfcmmngley.

JOHN HARRISON WILSON, C'Zerk, Providence Foundry, Stcmm'ngley. 

